Fuel burner



J. H. HUNT FUEL BURNER May 22, 1928.

Filed June 4, 1923 W/A ZZMX Patented May 22, 1928.

UNITED STATES 1,671,031 PATENT OFFICE.

JOHN H. HUNT, F DAYTON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO DELCO- REMY CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

FUEL BURNER.

Application filed June 4, 1923. Serial No. 643,144.

following description, reference being had to the accompanying drawings, wherein a preferred form of embodiment of the invention is clearly disclosed. I

In the. accompanying drawing a longitudinal crosssection of the device is shown as applied to a heater. This heater comprises the body portion or housing 23, a fragment of which is shown having a passage 152 through which fuel mixture is directedinto the combustion chamber 153 of "the heater, said housing being provided with a lug 156 passaged to; communicate with the combustion chamber 153, the interior of the lug being provided with screw threads 176.

.The heating unit comprises a plug or bushing 17 having a screw threaded portion adapted to be screwed into the threaded opening17 6 of the housing 23. Bushing 175 is provided with a reduced inner portion having an annular, shoulder 177. A fibrous packing 155 is interposed between the shoulder 177 and the annular-collar 179 formed on the hollow portion tube or sleeve 178 and a similar collar 155 is interposed between said annular shoulder 179 of, the porcelain sleeve 178 and theclampingnut 182,. said fibrous packing supporting the porcelain tube within the bushing 17 5. Tube or sleeve 178 extends into the combustion. chamber 153 and is provided with upwardly disposed oblique ventilating passages 180 and 181. .A hollow clamping nut 182 surrounds the porcelain-tube or sleeve 17 8, said nutbeing provided with an external threaded. portion which is insertible in the threaded portion 184 of bushing 175, the innerend of the nut engaging with the shoulder 18% of said porcelain sleeve 178 to hold said sleeve in position in the bushing 175. '65 The porcelain sleeve 178. has a longitu present invention will be apparent from the dinal passage, the portion 184 being of lesser diameter than the remaining portion of this passage, thereby providing a shoulder 185. A threaded spool 186 is adapted to fit in the larger diameter passage of the porcelain sleeve 178 resting upon the shoulder 185. This spool 186 is composed of any suitable insulating material, such as soapstone and has a wire 187 wound in the threads provided in the spool so that the wire is flush with the surface of said spool. The wire 187 may be formed of any suitable metal having a relatively high temperature coeflicient of resistance, such as iron or nickel, but the total resistance of the wire should normally be less than that of the heating coil 195' provided in the reduced portion 184 of the longitudinal passage in the porcelain tube. Theheating coil is preferably constructed of nichrome wire, one end of said coil being secured to the one end of wire 187 in any suitable manner, while the opposite end of said heating coil 195 is connected with a conducting bracket 196 attached to the bushing 17 5 so that the point of connection between the heating coil 195 and said bracket lies substantially axially with the combustion chamber 153. The opposite end of wire 187 extends through an axial passage formed in the threadedv por tion 191 of the terminal cap 190, said wire being in electrical connection with said threaded portion. The terminal cap 190 is provided with a rim 197 which is pressed or spun into the groove 198 formed in the porcelain tube 17 8 whereby said cap is held securely in posit-ion on said tube. Threaded portion 191 of said cap is adapted to receive a suitable terminal connection leading from any suitable source of current supply.

When it is desired to operate the heater any suitable circuit controlling switch, not shown, may be operated to cause current to flow from a source of supply to the terminal cap 190 through wire 187 connected therewith, heater coil 195, conducting bracket 196, bushing which being grounded permits current to return to the battry via the ground connection. This circuit will cause the coil to become hot.

Air under pressure will also fiow from the passage 150 to the orifice 151 into and through passage 152 and thus over the fuel nozzle 165, thereby causing fuel to be lifted from the pipe 27 and n-vzzle 1.65 and sprayed 11o into the combustion chamber Someot this fuel spray will contact direct With the exposed end Qf the, heating coil 195 and thereby 'abs'orb heat ,ither rirom Another portion of this spray Will fiov'v through passage 180 in the tube 178 and pass "down through the passage 184i contacting v v'ith the heating coil in said passage thereby absorb; ing heat, from thence this fuel mixture or sprayWillrhinglel With the otherspray in the. combustionf chamber 153. The sprayengaging or contacting with the heating 'c'oil .Will tend to 'vco'olthe same and prevent excessive heating thereof.

- ...The fuel mixture spray entering'tlirough f the passage l52ilito the'combustion. chamber 153 will enter through passages 180 and 181 into the chamber-.1843 in which theheating coil .195; is .p ositioned' thereby tending to eools'aid heating coil and consequently preventing excessive heating thereof.

The "burning spray projects into the sleeve 1 57..Where itvun-ite s with the combustion air,

entering through the distributing air holes 158. in order. that complete combustion may 'takeplace wherebyto heat any desired portio'n...otothe carburetor or engine preferably heating thereof, 'Ho eveL-if the operator should stop the sourc'eotair pressure supply and forget to break the circuit connections 'to the heating coil seriousinjury jmight reflsultilto said heatingcoi] through the ever- ;heating thereof 'anclfuseless Waste ofelectrical energ'ybe-caused,

.To avoid; oVerTheating the *wire "1817 is placed in thermal contact with the heating coil'195. The resistance of coil 195 is normaIlyFgreater than coil l87, hence. coil 195* will be "heated to .a igreater;degree than coil" 18?. .iHeat-genera'ted-by?coil9'195 jvvill be cond u cted to coil 187 to' con'troltheresistance thereof. Therefore, as the coil- 19 5 isyexcessively he'ated coil 187 'Will be abnorrnally heated and as the temperature of, coil "187 increases its "electrical resistance ,vvillhe l increased to reduce the flow? of eurrentitocoil 195, From i thisfiitmay lee-seen" that the 1 temperature of coil 3195 will be held substans tially in a safe value. llhe protectingg coil -187 isnfost advantageously located in the {present invention, since it-is located directly 1 relations to'said' heatingcoil and connected "electrically infseriesth rewith I The present invention provides an easily 'fasfairunder pressure flows Ithrough passageyl50, orifice 151 and-passage 152 into theicombustion chamber 1:53, the

' "spray caused by such "air flow will; en-

gage With the heating 'coil 195 and thus absorb 'he'at "therefrom to prevent excessive coilbe injured the nut 182 may be removed it'hich permits removal of the entire heating unit-and thereb v the spool 186, ,Wire 187 and coil 195 may" be readily removed for the purposes of. replacement.

While the form of mechanism herein shown and described constitutes a preferred of embodiment of theinvention. itis to be understood that other forms might :be

claim s ivhich follow.

'What I claim is as follows? adopted, al,l coming t'vit'hin the scope of the A11 electical unit' 'adapted for h'eat-.

sleeve supported Within the plug, aresi'stance "element supported. withins'aid sleeve, and a heating coil suspended from said resistance "element and connected with the 2. An electrical unitfadapted for heating tuel comprising a plug, an insulating "sleeve su ported within "th plug, a resistance element supported vvitliin said sleeve,

rect thermal relation therewith for regulating the resistance" of 1 thercircuit for conductmg current tofthecoil.

7 4E. "An electricalunit adapted to heat fuel comprising" a plug, fan insulating sleeve" supported withln the 1 pfhigga resistance 1 element antla heatin coil suported {within said sleeve, said j's'leeve 'provi'ded *wlth ducts for ventilating theheating'. coil.

"5. An' electrical unitadapteth to heat fuel coniprisin'ga plug, and insulating sleeve supported Within the; plug, a resistance i element supported Within Sara :sleeve, '2 heat I inlgjcoil su pended. from said resistance' elef rnent having a portion extending; outside -the sleeve "and liaving'connection with? the-plug,

said sleevefibe'ing provided 'wvith ducts adjabentf the heating 'coil "tor ventilating, the

v 6 iXneIectticaIunit' adapted to heat fuel comprising ;a "plugjanfinsulating .sleeve' supported Within "the Lplugf 'said sleeve I having @F'sjepp b r pro idi a f h l r, a 'threaded'spoolisuppoitedjbysaid shoulder, a resistancefeler'nent "mounted on said spool, above the heatingcoil and in heat' recei ving and; a 'heating coil attached "to said resist- 'ing tuel comprisingfa plug, an insulating 7. An electrical unit adapted to heat fuel comprising a plug, an insulating sleeve supported within the plug, said sleeve having stepped bore providing a shoulder, a threaded spool supported by said shoulder, a resistance element mounted on said spool, a heating coil attached to said resistance element and extending vaxially through the smaller bore and having connection with said plug outside the sleeve, and means for ventilating the smaller bore.

In testimony whereof I hereto aflix my 2 signature.

JOHN H. HUNT. 

